58 lines
1.3 KiB
C++
58 lines
1.3 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#pragma once
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#include "base/bytes.h"
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namespace Storage {
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constexpr auto kSaltSize = size_type(64);
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class CtrState {
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public:
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static constexpr auto kBlockSize = size_type(16);
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static constexpr auto kKeySize = size_type(32);
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static constexpr auto kIvSize = kBlockSize;
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CtrState(bytes::const_span key, bytes::const_span iv);
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void encrypt(bytes::span data, int64 offset);
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void decrypt(bytes::span data, int64 offset);
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private:
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template <typename Method>
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void process(bytes::span data, int64 offset, Method method);
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bytes::array<kIvSize> incrementedIv(int64 blockIndex);
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static constexpr auto EcountSize = kBlockSize;
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bytes::array<kKeySize> _key;
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bytes::array<kIvSize> _iv;
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};
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class EncryptionKey {
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public:
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static constexpr auto kSize = size_type(256);
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EncryptionKey() = default;
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explicit EncryptionKey(bytes::vector &&data);
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bool empty() const;
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explicit operator bool() const;
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const bytes::vector &data() const;
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CtrState prepareCtrState(bytes::const_span salt) const;
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private:
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bytes::vector _data;
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};
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} // namespace Storage
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